Long stroke jack



March 8, 1932.

Filed Aug. 29, 1930 2 Sheets-Sheet W i a M w M H W. 4 Lil. fiply-11571-11}---11---- 2 0 HH J 0 J i 1 2 i 5 M- 5 0O D0000O0000.0.0.0000 000 0. a

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J. S. HUNTER- LONG STROKE JACK Filed Aug. 29, 1930 2 Sheets-Sheet f/vVE/V 70R J /m 6. Hun/er;

Patented Mar. 8, 1932 PATENT OFFICE JOHN S. HUNTER, OF COALINGA,CALIFORNIA Lone STROKE JACK Application filed August 29, 1930. SerialNo. 478,631.

My invention relates to pumping jacks for use in reciprocating thesucker rods of a pump, and relates particularly to a simple form of longstroke pump mechanism.

5 Owing to the fact that there is a definite stretch in a string of pumprods, a portion of the movement of the pump jack on each upward strokeis devoted to stretching the rods,

and it is only after the pump rods have been 1 stretched that movementof the pump plunger orpump piston is obtained. It is an object of myinvention to provide a pump jack or reciprocating mechanism by which apump plunger may be moved through a long 15 stroke, and accordingly itis an object of the invention to provide a reciprocating mechatheefiiciency of the pumping be considerably increased by increase in thestroke of the nism whereby operation may reason of such pump.

It is an object of the invention to provide a pump jack having acontinuous chain which travels through vertically elongated loops andhas projections thereon adapted to en 25 gage and reciprocate a crosshead which has means for attaching it to the upper end of a string ofsucker rods or to the polish rod situated at the upper end of the stringof sucker rods.

30 Further advantages and the specific novel and valuable details of myinvention will be clearly pointed out in the following part of thespecification.

Referring to the drawings,

35 illustrative purposes only,

Fig. 1 is an elevational view of a simple preferred embodiment of myinvention.

Fig. 2 is a view similar to Fig. 1 showing the cross head thereof inraised position and 40 having the lower portion thereof partly sectionedon a vertical plane.

Fig. 3 is a vertical cross section through the pumping jack, with theparts thereof in raised position.

Fig. 4- is a fragmentary section on a plane represented by the line 4-'4of Fig. 3.

Fig. 5 is a horizontal cross section on a plane represented by the line5-5 of Fig. 1.

50 Fig. 6 is a fragmentary cross sectlon on a plane represented by theline 6-6 of Fig. 1.

which are for As shown in the drawings, my invention includes a crosshead 10 adapted to move in vert1cal guides 11, each of which, as shownin Fig. 5, consists of a pair of vertical angle members 12 and a sideplate 13 which supports a vertical bar or track member 14 so positionedthat it will be engaged by grooved wheels 15 carried on shafts 16extending between front and back plates 17 and 18 of the cross head 10.In the simple construction shown the cross head 10 consists of the frontand back plates 17 and 18 secured together and held in spacedrelationship by the shaft members 16, the plates 17 and 18 being of suchwidth that the edges 20 thereof overlap the angles 12 of the guides 11.Near the lower ends of the guide means consisting of the guide members11 is mounted a rectangular frame 21 having side plates 22 carryingbearings 23 in which a primary shaft 24 is journalled. On this primaryshaft 24 are secured a pair of primary wheel members which preferablyhave the form of sprockets 25, and outside of the sprockets 25 the shaftreceives the lower ends of supporting means or plates 26, these plates26 having openings 27 therein through which the shaft 24 extends, asshown in Fig. 6. The upper and lower ends of the plates 26 aresemi-circular in form, and near the upper ends thereof openings 28 areprovided into which the ends of a secondary shaft 30 extend, as bestshown in Fig. 4. On the shaft 30 secondary wheel members 31 are mountedin spaced relationship, and over the upper and lower cooperating pairsof wheel members 31 and 25 continuous traveling members or chains 32 areext-ended so as to form vertically elongated loops.

The upper end of the supporting means is provided with a central block33 having a pair of downwardly extending side plates or legs 34 whichare bent outwardly and are secured at35 to the inner faces of the plates26. In the upper portion of the block 33 is a vertical opening 36adapted to receive the lower end 37 of a vertically extending holdingpin '38 which is carried in a bracket 39 which projects downwardly froma cross member 40, this bracket 39 including a lower of other parts,elements, or mechanisms which may be employed in substantially the samemanner to accomplish substantially the same results; therefore, it is tobe understood that the invention should not be limited to the detailsdisclosed herein but should be accorded the full scope of the followingclaims.

I claim as my invention:

1. A pump jack of the character described, including: a travelingmember; supporting means for holding saidtrav-eling member in the formof a loop; means for supporting the primary end of said supportingmeans; a latch forholding the secondary end of said supporting means inaligned position; a cross head; guide means for guiding said cross headalong said loop formed by said traveling member; means for disengagingsaid latch when said cross head approaches the secondary end of itstravel; an engager carried by said traveling member for engaging andmoving said cross head; and means for producing movement of saidtraveling member through the path defined by the loop through which saidtraveling member extends.

2. A pump jack of the character described, including: a travelingmember; supporting means for holding said traveling member in the formof a loop; means for supporting the primary end of said supportingmeans; a holding pin; means for yieldably maintaining said holding pinin engagement with the secondary end of said supporting means, forholding said secondary end of said support-- ing means in alignment; alifter adapted to move said holding pin from engagement with saidsecondary end of said supporting means when said cross head approachesthe secondary end of its travel; an engager carried by said travelingmember for engaging and moving said cross head; and means for producingmovement of said traveling member through the path defined by the loopthrough which said traveling member extends.

3. A pump jack of the character described, including: a travelingmember; supporting means for holding said traveling member in the formof a loop; a shaft extending through and supporting the primary end ofsaid supporting means; shaft supports engaged by said shaft; a latch forholding the secondary end of said supporting means in aligned posi tion;a cross head; guide means for guiding said cross head along said loopformed by said traveling member; means for disengaging said latch whensaid cross head approaches the secondary end of its travel; an engagercarried by said traveling member for engaging and moving said crosshead; and a wheel member on said shaft for causing said traveling memberto move through its loop path.

4. A pump jack of the character described, including: a travelingmember; supporting means for holding said traveling member in the formof a loop; a shaft extending through and supporting the primary end ofsaid supporting means; shaft supports engaged by said shaft; a holdingpin; means for yieldably maintaining said holding pin in engagement withthe secondary end of said supporting means, for holding said secondaryend of said supporting means in alignment; a lifter adaptedto move saidholding pin from engagement with said secondary end of said supportingmeans when said cross head approaches the secondary end of its travel;an engager carried by said traveling member for engaging and moving saidcross head; and a wheel member on said shaft for causing said travelingmember to move through its loop path.

5. A pump jack of the character described, including: a travelingmember; supporting means for holding said traveling member in the formof a loop a shaft extending through and supporting the primary end ofsaid supporting'means; shaft supports engaged by said shaft; a latch forholding the secondary end of said supporting means in aligned position;a cross head; guide means for guiding said cross head along said loopformed by said traveling member; means for disengaging said latch whensaid cross head approaches the secondary end of its travel; an engagercarried by said traveling member for engaging and moving said crosshead; a wheel member on said shaft for causing said traveling member tomove through its .loop path; and a wheel member at the secondary end ofsaid supporting means over which said traveling member is extended.

6. A pump jack of the character described, including: a travelingmember; supporting means for holding said traveling member in the formof a loop a shaft extending through and supporting the primary end ofsaid supporting means; shaft supports engaged by said shaft; a holdingpin; means for yieldably maintaining said holding pin in engagement withthe secondary end of said supporting means, for holding said secondaryend of said supporting means in alignment; a lifter adapted to move saidholding pin from engagement with said secondary end of said supportingmeans when said cross head approaches the secondary end of its travel;an engager carried by said traveling member forengaging and moving saidcross head; a wheel member on said shaft for causing said travelingmember to move through its loop path; and a wheel member at thesecondary end of said supporting means over which said traveling memberis extended.

7 A pump jack of the character described, including: a continuous chain;supporting means for holding said chain in the form of a loop; means forsupporting the primary end of said supporting means; a latch for holdingthe secondary end of said, supporting means inaligned. position; across-head,

- guide means for guiding said cross head along said loop formed by saidchain; means for disengaglng and latchwhen said cross head approachesthe secondary end of its travel;an;en'gager carriedsby said chain'forengagingand moving said cross-head; and means "for producing movementof'said chain throughthe path defined by the loop through which saidchain extends. i V I n v V 8. Apump jack of the characterydescribed,including continuous chain; supporting means'for holding saidchainfiinthe form {of a loop; a shaft extending through and supporting theprimary end of'said supporting 'means; shaft supports engaged by saidshaft; a latch for holding the secondary'end of said supporting means inaligned position; across head; guide means for guiding said cross headalongsaid loop formed by Said chain; means forr'disengaging said latchWhensaid cross head-approaches the secondaryendof its travel; an engagercarried by said chain for engaging and moving said cross head; and aWheel member on said shaft for causingsaidchain to move. through its'loop path,

; 9 Apump jack of the character described;

includin a continuous chain' su ortin means for holding said chain inthe form of "auloop; a shaft extending throughand supporting the primaryend of said supporting means shaft supports engaged by said shaft;

a'holding pin; means for yleldably maintaining said holding pin inengagement With the 7 secondary end ofsaid support ng means, for

' holding said secondary end of said support-- ,ing meansin -alignment;a lifter-adapted to ll'lQV-B-Silld holding pin from engagement Withjsaidsecondary end of'said supporting .means'when said cross head approachesthe secondary end of its travel; an 'engager car- :ried by said chainfor engaging and moving including :a traveling member forming a continuous loop; supporting means extending from the-primary end of said loopto the secondary end thereof for. holding 1 said loop in operativeposition a permanent structure supporting the primary end of saidsupporting means guide means extending along said loop; a cross headguided by, said guide means so as to;move along saidloop, said crosshead supportingthe secondary end of said supporting means Workingalignment when said cross head is "at the secondary end. of saidsupportingmeans, there being means for supporting said secondary end ofsaid supporting means in Workingalignment when said cross head is awayfrom said secondary end engagers connecting said traveling member withsaid cross, head soasto move said cross head-in saidg uide means; andmeans for producing movement iof said traveling member onsaid supportingmeans.

In testimony whereof, I have hereunto set my hand at Los Angeles,California this said cross head; a Wheel member on said shaft 7 forcausing said chain to move through its loop path ;-and a Wheelmernber atthesecondmy end of said supporting means over which saidchain isextended.

- r 10; Apump jack ofthe characterdescri'bed,

including: atravelingmember forming a continuous-loop supporting meansfor hold 'ing -said" traveling member in vertically I elongatedposition;per1nanent structure at the (lower end of-said --supporting means forsupporting said supporting. means; a" cross dread; & means for a guidingsaid cross head along-said supportingmeans, said-cross head .rhaving--means moving therewith for maintaining the upper end ofsaidisupporting meansin worklng alignment engagers carried on vsaidtraveling member and engag- SingsaidcrOss head sola s to' reciprocateit;

and means forproducingmovement of said vtrampling member on saidsupport1ng means.

711. A pumpjack of the character described, I

